package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @author 杨帆
 * @version 1.0
 */
public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取请求头里面的token
        String token = request.getHeader("authorization");
        if(StrUtil.isBlank(token)){
            return  true;
        }
        //基于token,获取redis用户
        String key = RedisConstants.LOGIN_USER_KEY+token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);
        if(userMap.isEmpty()){
            return true;
        }
        //将查询的hash数据转化为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        //存放，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);

        //刷新token有效期，只要用户超过30分钟没有操作，则清除redis里面的数据，用户则会自动退出
        stringRedisTemplate.expire(key,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);

        //放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
